Re: 2.6.18 - AHCI detection pauses excessively

[Tejun Heo]

Berck E. Nash wrote:
> AHCI pauses heartily on during detection boot, but eventually proceeds. 
>  I've mentioned the problem before, but have since narrowed it down a 
> bit.  The problem does not occur in 2.6.17.3, but does occur in 2.6.18. 
>  The problem is still occurring both in 2.6.19-rc5 as well as 
> 2.6.19-rc5-mm1.
>
> Please cc me on replies since I am not subscribed to LKML.
>
> Messages surrounding the hang:
>
> scsi2 : ahci
> ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
> ata2.00: qc timeout (cmd 0xec)
> ata2.00: failed to IDENTIFY (I/O error, err_mask=0x104)
> ata2: port is slow to respond, please be patient (Status 0x80)
> ata2: port failed to respond (30 secs, Status 0x80)
> ata2: COMRESET failed (device not ready)
> ata2: hardreset failed, retrying in 5 secs
> ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
> ata2.00: ATA-6, max UDMA/133, 640 sectors: LBA
> ata2.00: ata2: dev 0 multi count 1
> ata2.00: configured for UDMA/133
>
> I should note that on this system ata1 and ata3 both detect quickly, but 
> they have 1.5 Gbps devices whereas ata2 has a 3.0Gbps device.

Hmmm.. Can you try with the attached patch applied?  Also, please turn 
on kernel config 'Kernel Hacking -> Show timing info on printks' and 
report boot dmesg.

Thanks.

--
tejun
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